<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
       .top{
           width: 400px;
           height: 60px;
           background-color: #edecfa;
           color: gray;
           line-height: 60px;
           text-align: center;
           border: 1px dotted gray;
       }
       .banner{
           width: 400px;
           height: 40px;
           background-color: #edecfa;
           border: 1px dotted gray;
           line-height: 40px;
           text-align: center;
           margin-top: 5px;
           color: gray;
       }
       .left{
           float: left;
           width: 120px;
           height: 150px;
           background-color: #edecfa;
           color: gray;
           text-align: center;
           line-height: 150px;
           margin-top: 5px;
           border: 1px dotted gray;
       }
       .right{
           float: left;
           width: 275px;
           height: 150px;
           background-color: #edecfa;
           text-align: center;
           line-height: 150px;
           border: 1px dotted gray;
           margin-top: 5px;
           margin-left: 5px;
           color: gray;
       }
       .footer{
           width: 400px;
           height: 170px;
           color: gray;
           line-height: 170px;
           text-align: center;
           background-color: #edecfa;
           border: 1px dotted gray;
           margin-top: 5px;
       }
    </style>
</head>
<body>
   <div class="top">top</div>
   <div class="banner">banner</div>
   <div class="left">left</div>
   <div class="right">right</div>
   <div style="clear: both;"></div>
   <div class="footer">footer</div>
</body>
</html>